Temporal variation in usnic acid concentration in Usnea aurantiaco-atra in Antarctica
Entry ID: 110-88_01

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Summary
Abstract: In Usnea aurantiaco-atra, growing in the Antarctica, a monthly variation in the
usnic acid content, in individual thalli, was studied by means of scanning
densitometry (HPTLC). The higher accumulation rates were quantified from
January to May; there was a significant decrease in the concentrations from
June to December, during the three years of study. In spite of the thalli were
taken from a same location, variations could be observed in the usnic acid
concentration in the individuals from within each monthly sample.

Geographic Coverage
 N: -62.28 S: -62.28  E: -57.37  W: -57.37

Data Set Citation
Dataset Originator/Creator: Wanda Quilhot et al
Dataset Title: Lichen secondary products and their importance in environmental studies
Dataset Release Date: 1998-05-01
Dataset Release Place: Sao Paulo, Brazil
Dataset Publisher: Seaward (Eds)
Version: 1
Issue Identification: Lichenology in Latin America: history, current knowledge and applications
Data Presentation Form: Tables and graphics


Temporal Coverage
Start Date: 1987-02-05
Stop Date: 1989-12-05


Location Keywords
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR


Science Keywords
BIOSPHERE >TERRESTRIAL ECOSYSTEMS >ALPINE/TUNDRA    [Definition]
BIOLOGICAL CLASSIFICATION >FUNGI >LICHENS    [Definition]


ISO Topic Category
BIOTA


Quality
Mats of Usnea aurantiaco-atra, growing in an open space, were collected monthly
-when possible- in the area of Baliza Poisson, Arturo Prat Base, and Greenwich
Island from February 1987 to December 1989. The lichenic material was dried at
room temperature and was packed until it was taken to the laboratory. Fifteen
erect sterile thalli were chosen randomly from two mats per month. The dry
weight of each thallus was estimated in an oven at 50 deg. C; then they were
macerated in acetone successively for 72 h and 24 h, at room temperature. The
extracts were filtered and combined. The quantification of usnic acid was
performed though scanning densitometry (HPTLC).


Access Constraints
Public information


Use Constraints
Public information


Keywords
Antarctic lichens
thalli
lichen metabolites
usnic acid
monthly variations
accumulation rates
catabolism
Baliza Poisson
Arturo Prat Base
Greenwich Island


Data Set Progress
COMPLETE


Data Center
Centro Nacional de Datos Antarticos, Instituto Antartico Chileno, Chile    [Information]
Data Center URL: http://www.inach.cl/

Data Center Personnel
Name: RICARDO JANA
Phone: ++56 /61/ 298135
Fax: ++56 /61/ 298149
Email: rjana at inach.cl
Contact Address:
Plaza Munoz Gamero 1055
XII Region
City: Punta Arenas
Country: Chile


Personnel
DORIS NATHALIE JORQUERA
Role: DIF AUTHOR
Email: djorquer at inach.cl
Contact Address:
Luis Thayer Ojeda 814
Providencia
City: Santiago
Country: Chile


WANDA QUILHOT
Role: TECHNICAL CONTACT
Phone: (32) 28 19 52
Email: wquilhot at uv.cl
Contact Address:
Universidad de Valparaiso
Casilla 5001
City: Valparaiso
Country: Chile


Publications/References
Quilhot W., W. Pena; E. Flores; M. E. Hidalgo; E. Fernandez and G. Lllelighton (1991), Variacion temporal en la concentracion de acido usnico en Usnea aurantiaco-atra (Jaq.), Bory. Ser. Cient. INACH 41, 99-106

Quilhot W.; M. E. Hidalgo; E. Fernandez; W. Pena and E. Flores (1991), Posible rol biologico de metabolitos secundarios en liquenes antarticos, Ser. Cient. INACH 42, 53-59

Quilhot, W.; E. Fernandez; C. Rubio; M. Goddard and M.E. Hidalgo, 1998. Lichen secondary products and their importance in environmental studies. Lichenology in Latin America: history, current knowledge and applications. Seaward (Eds). p. 171-179. CETESB. Sao Paulo.

Creation and Review Dates
DIF Creation Date: 2005-03-11
Last DIF Revision Date: 2011-04-07

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